Brake-shoe with reinforced back.



D. RAWSTRON. A

BRAKEl sHoE WITH RBINFoRcED BACK.

. y APPLIION l:FILED APB.. 16, 1910.

999,259. Patented Aug. 1,1911.

M A m narra einen rarer rc.

DONALD RAWSTRON, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAMES F. HILL, OFCHICAGO, ILLINOIS.

BRAKE-SHOE WITH REINFORCED BACK.

Specification of Letters Patent.

Patented; Aug. 1, 1911.

Application led April 15, 1910. Serial No. 555,559.

10 all whom it may concern:

Be it known that I, DONALD RAwsTRoN, a citizen of the United States ofAmerica, and resident of Chicago, Cook county, Illinois, have invented acertain new and useful Improvement in Brake-Shoes with Reinforced Backs,of which the following is a specification.

My invention relates to improvements in brake shoes, and has for itsobject the production of a shoe that is so formed that it can never fallapart, regardless of the number of pieces into which it may be broken.

A further object is the production of a cheap and efficient shoe, andone of simple construction.

These and such other objects as may hereinafter appear are attained bymy device, an embodiment of which is illustrated in the accompanyingdrawings, in which- Figure l represents a sectional view of a flaskcontaining my improved shoe. Fig. 2 represents a top plan view of abrake shoe embodying my improvement. Fig. 3 represents a sectional viewon line 3-3 of Fig. 2, looking in the direction indicated by the arrows.Fig. t represents a sectional detail of a modified form of my invention.

Like numerals of reference indicate like parts in the several figures ofthe drawings.

Referring now to the drawings: A represents a mold or flask comprising acope 5 and drag 5a with the completed shoe 6 in place.

rlhe process of manufacturing the shoe is as follows: After the mold isformed, a plurality of tie rods, comprising a straight portion 7 andupturned ends 7a, are placed within the mold in staggered relation byforcing the sharpened ends 7 into the sand of the cope, the straightportion of the rods being entirely within the mold and a short distancefrom the face of the sand in the cope. The metal is then poured throughthe sprue opening 8 filling the mold and entirely surrounding themembers 7 and the portions of the upright members 7a adjacent thereto.W'hen the shoe is removed from the mold the ends of the members 7a willproject out from the face of the back and will be cut off close t0 theback.

The tie rods are preferably made from lengths of rod, say aboutthree-eighths of an inch in diameter, the pieces cut apart diagonallyand the ends bent upwardly, thus forming sharp ends that penetrate thesand of the cope without disturbing its face. The inserts can bearranged in any desired manner over the face of the cope, but T preferto place them in staggered relation, as clearly shown in Fig. 2.

In the modification shown in Fig. 4, the upturned ends of the rods 9 areupset or flattened; as shown at 10, and a sprue or spike 1l fitted ineach end. This spike is forced into the face of the cope the same as thesharpened end 7a and the flat surface of the upset end l() rests againstthe face of the sand in the cope. The spike may be formed of wood andbroken off after the shoe is cast, leaving the base of the upset endflush with the back of the shoe. This form of insert, by reason of theshape of the ends, is securely wedged within the body of the casting.Either form of construction, however, serves the purpose of holding Jthepieces together in case the shoe is fractured, and preventing it fromfalling away from the brake head.

nHeretofore in reinforcing the backs of shoes, pieces of metal have beenemployed with the result that it was necessary to suspend them in themold while the shoe is being cast. This form of shoe is alsoobjectionable for the reason that in the event of the fracturing of theshoe the several parts are very liable to fall or pull apart, while inmy construction the rods having upturned ends hold all the partstogether, even in case of fracture, regardless of the wear or strain putupon the shoe.

While I have shown straight pieces of rod for use as inserts, T may, ofcourse, use any other form that will serve the purpose. For instance, Imight substitute a series of interlocking rods with bent ends (notshown), but for ordinary use I find my present form to be eminentlysatisfactory.

I claim:

l. A reinforced brake shoe comprising a cast body, a plurality ofinserts embedded near the back face thereof, the ends of said insertsbeing upturned and extending to the back face of said shoe.

2. A reinforced brake shoe comprising a cast body, a plurality oflongitudinally disposed inserts embedded near the back face thereof, theends of said inserts being upturned and extending to the back face ofsaid shoe.

3. A reinforced brake shoe comprising a cast body, a plurality ofinserts embedded near the back face thereof in staggered relation toeach other, the ends of said inserts being upturned and extending to theback face of said shoe.

4. A reinforced brake shoe comprising a cast body, a plurality oflongitudinally disposed inserts embedded near the back face thereof instaggered relation to each other, the ends of said inserts beingupturned and extending to the back face of said shoe.

5. A reinforced brake shoe comprising a cast body, a plurality ofinserts comprising rods bent at their ends and disposed longitudinallyWithin said shoe and near its back face With the bent ends substantiallyflush with the back face of the shoe.

6. A reinforced brake shoe comprising a cast body, a plurality ofinserts embedded near the back face thereof, the ends of said insertsbeing bent and enlarged and extending to the back face of said shoe.

7. A reinforced brake shoe comprising a cast body, a plurality ofinserts comprising rods bent at their ends and disposed longitudinallyWithin said shoe and near its back face With the bent ends enlarged andsubstantially flush With the back face of the shoe.

8. A reinforced brake shoe comprising a cast body, and an insertembedded in the back face thereof, the ends of said insert being bentand extending to the face of said shoe.

Signed by me at Chicago, Illinois, this lst day of April, 1910.

DONALD RAVSTRON.

Witnesses:

E. H. CLEGG, S. LEWIS.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

